1. Sobolev Spaces;Adams,1975
2. Characterizations of the ranges of some nonlinear operators and applications to boundary value problems;Brezis;Ann. Scuola Norm. Sup. Pisa,1978
3. On periodic solutions of superlinear parabolic problems;Esteban;Trans. Amer. Math. Soc.,1986
4. Partial Differential Equations;Friedman,1969
5. Topics in Functional Analysis and Applications;Kesavan,1989